Fastloc GPS system used for collecting dive data from bowhead whales in Disko Bay from 2008 to 2011. (A) The electronic package shaped as a 'yellow submarine’ with the wire to the harpoon-head anchor system. Three magnesium bolts on the wire ensure release from the whale after a fixed period of time. (B) The tag is deployed with an 8 m fiberglass pole from a fast dinghy. A biopsy is collected simultaneously. (C) The tag is dragged alongside the whale.